Explanation: Chennai, the capital city of Tamil Nadu, has a rich history and cultural significance. Understanding the context of Chennai's festivals, historical name, and climate is crucial for comprehending the given statements.
1. **Festivals in Chennai**: Chennai, like many other cities in India, celebrates a variety of festivals. However, the main festivals celebrated in Chennai are Pongal, Diwali, and Christmas. Holi, while celebrated in some parts of Chennai, is not considered the main festival. Holi is more prominently celebrated in North India, particularly in states like Uttar Pradesh, Bihar, and West Bengal. Therefore, the first statement is incorrect.
2. **Historical Name of Chennai**: Chennai was formerly known as Madras. The name Madras was used during the British colonial period and was officially changed to Chennai in 1996. This change was part of a broader effort to rename cities and places with their original Tamil names. Hence, the second statement is correct.
3. **Climate of Chennai**: Chennai has a tropical climate with high temperatures throughout the year. The city experiences hot and humid weather, especially during the summer months. The average temperature ranges from 20°C to 35°C. Due to this warm climate, woollen clothes are not typically needed in Chennai. Therefore, the third statement is incorrect.
In summary, the correct answer is (A) Only 2, as the second statement is the only true statement among the given options. Understanding the cultural and climatic context of Chennai is essential to correctly evaluate these statements.